Coffered ceiling + basic truss question
Coffered ceiling + basic truss question
(OP)
I have a house project with a sloped coffered ceilling. I dont work for a truss manuf. I just specify the roof structure to use trusses. Now, I think the only way to make the sloped coffered celing to work is if we support the trusses at the rafter tails. Do you do this often?
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I also see another reply by CJSchwartz (ty for being very active on this forum). He said that he usually put the girder truss on hip roof about 7' from the exterior wall (set back). My boss always tell me to go 2:1 ratio (girder to wall:girder to ridge). Shall I start using this 7' set back with maybe some adjusment so that the girder wont land on a window? This 7' rule of thumb, is that so you will have enough depth on the girder? Please advise. Usually I have to layout the trusses before we even know who they will buy the trusses from so I have nobody to talk to. I just want to lay the trusses out the way truss manuf. like to do. Thanks!
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I also see another reply by CJSchwartz (ty for being very active on this forum). He said that he usually put the girder truss on hip roof about 7' from the exterior wall (set back). My boss always tell me to go 2:1 ratio (girder to wall:girder to ridge). Shall I start using this 7' set back with maybe some adjusment so that the girder wont land on a window? This 7' rule of thumb, is that so you will have enough depth on the girder? Please advise. Usually I have to layout the trusses before we even know who they will buy the trusses from so I have nobody to talk to. I just want to lay the trusses out the way truss manuf. like to do. Thanks!
http://www.swijetty.com
Sea Water Intake and Jetty Construction





RE: Coffered ceiling + basic truss question
We use 5' or 7' setbacks to keep the End Jack trusses small and simple (2x4 top and bottom chord). One rule of thumb, the shallower the pitch, the further back you'll need to be. When the length of the building isn't a nice whole number dimension, we'll space our trusses down from the ridge and makeup the oddball dimension in the girder setback (between 5 and 7 feet) because it's easy to make the end jacks say 5'-3" long. That being said, if the building designer specs a dimension for setback to miss a window header or something, the truss designer should honor that.
For reference, most of the trusses we build are 35psf LL for our area.
RE: Coffered ceiling + basic truss question
I agree with ctcray. Also, different manufacturers design different hip end types. So, depending on the style they use, they may have a different set back rule. The types of hip ends are typically regional, so it is best to find out what is mostly used in your area.
RE: Coffered ceiling + basic truss question
http://www.swijetty.com
Sea Water Intake and Jetty Construction
RE: Coffered ceiling + basic truss question
RE: Coffered ceiling + basic truss question
Now, when I measure the set back, is that from the center of the exterior wall or from the edge of exterior wall? we only draw lines and we dont show the actual thickness of the 2x. So the line of truss at the intersection of girder and hip, do you put it exactly at the intersection or put it .75" from the intersection toward the ridge (assuming the truss is 1.5" wide).
http://www.swijetty.com
Sea Water Intake and Jetty Construction
RE: Coffered ceiling + basic truss question
Unless the exact location of a truss matters to you, I wouldn't try to be that specific in showing your trusses. I generally indicate with a double-ended arrow the span direction of the trusses and indicate spacing at 24"oc. Only if I want a precise location of a girder or a certain minimum number of plys do I draw and dimension a line for the actual truss. That gives the truss designer (and framer) some latitude in his layout.
RE: Coffered ceiling + basic truss question
http://www.swijetty.com
Sea Water Intake and Jetty Construction
RE: Coffered ceiling + basic truss question
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2'space 1' space
RE: Coffered ceiling + basic truss question
http://www.swijetty.com
Sea Water Intake and Jetty Construction